diff --git a/Aircraft/Generic/soaring-instrumentation-sdk.nas b/Aircraft/Generic/soaring-instrumentation-sdk.nas
index fcce506d5..a08a151bd 100644
--- a/Aircraft/Generic/soaring-instrumentation-sdk.nas
+++ b/Aircraft/Generic/soaring-instrumentation-sdk.nas
@@ -409,3 +409,34 @@ var SpeedCmdVario = {
 		if (me.on_update != nil) me.on_update(me.output);
 	}
 };
+
+# Vario sound pitch controller
+# Computes the frequency factor for a variometer sound.
+#
+# var vario_sound = SoundPitchController.new(
+#   input: Object connected to the pitch controller input, e.g. a variometer reading.
+#   max_pitch: (optional) Maximum sound frequency factor, the output will be
+#              in the range [1/max_pitch, max_pitch], default 2.
+#   max_input: Value of input for which max_pitch is reached.
+#	on_update: (optional) function to call whenever a new output is available
+
+var SoundPitchController = {
+    parents: [InstrumentComponent],
+
+    new: func(input, max_input, max_pitch = 2, on_update = nil) {
+        return {
+            parents: [me],
+            input: input,
+            max_pitch: max_pitch,
+            max_input: max_input,
+            on_update: on_update,
+        };
+    },
+
+    update: func {
+        var input = math.clamp(me.input.output, -me.max_input, me.max_input);
+        me.output = math.pow(me.max_pitch, input / me.max_input);
+
+        if (me.on_update != nil) me.on_update(me.output);
+    },
+};
diff --git a/Aircraft/Instruments-3d/glider/vario/ilec-sc7/README_install b/Aircraft/Instruments-3d/glider/vario/ilec-sc7/README_install
index dce9c1af1..e9b87e50c 100644
--- a/Aircraft/Instruments-3d/glider/vario/ilec-sc7/README_install
+++ b/Aircraft/Instruments-3d/glider/vario/ilec-sc7/README_install
@@ -7,60 +7,57 @@ You will need to :
 * modify your sound.xml, including the following lines :
 
 <variometer-up>
-   <name>variometer-up</name>
-   <mode>looped</mode>
-   <path>Instruments-3d/glider/vario/ilec-sc7/vario.wav</path>
-   <condition>
-   <and>
-     <greater-than>
-      <property>instrumentation/ilec-sc7/audio</property>
-     <value>0</value>
-     </greater-than>
-     <greater-than>
-	 <property>instrumentation/ilec-sc7/te-reading-mps</property>
-     <value>0.01</value>
-     </greater-than>
-     </and>
-    </condition>
-    <pitch>
-     <property>instrumentation/ilec-sc7/te-reading-mps</property> 
-     <factor>0.246</factor>
-     <offset>1.0</offset>
-    </pitch>
-    <volume>
-     <property>instrumentation/ilec-sc7/volume</property>
-     <max>1</max>
-    </volume>
-  </variometer-up>
-  
-<variometer-down>
-   <name>variometer-down</name>
-   <mode>looped</mode>
-   <path>Instruments-3d/glider/vario/ilec-sc7/vario2.wav</path>
-    <condition>
+  <name>variometer-up</name>
+  <mode>looped</mode>
+  <path>Instruments-3d/glider/vario/ilec-sc7/vario.wav</path>
+  <condition>
     <and>
-     <equals>
-     <property>instrumentation/ilec-sc7/audio</property>
-     <value>2</value>
-     </equals>
-     <greater-than>
-      <property>instrumentation/ilec-sc7/te-reading-mps</property>
-      <value>-10.66</value>
-     </greater-than>
-    <less-than>
-      <property>instrumentation/ilec-sc7/te-reading-mps</property>
-      <value>-0.01</value>
-     </less-than>
+      <greater-than>
+        <property>instrumentation/ilec-sc7/audio</property>
+        <value>0</value>
+      </greater-than>
+      <greater-than>
+        <property>instrumentation/ilec-sc7/te-reading-mps</property>
+        <value>0.01</value>
+      </greater-than>
     </and>
-    </condition>
-    <pitch>
-     <property>instrumentation/ilec-sc7/te-reading-neg</property>
-     <factor>-0.05</factor>
-     <offset>1.0</offset>
-    </pitch>
-    <volume>
-     <property>instrumentation/ilec-sc7/volume</property>
-     <max>1</max>
-    </volume>
-    
+  </condition>
+  <pitch>
+    <property>/instrumentation/ilec-sc7/sound-pitch</property>
+    <offset>0</offset><!-- Do not remove, default is 1 -->
+  </pitch>
+  <volume>
+    <property>instrumentation/ilec-sc7/volume</property>
+    <max>1</max>
+  </volume>
+</variometer-up>
+
+<variometer-down>
+  <name>variometer-down</name>
+  <mode>looped</mode>
+  <path>Instruments-3d/glider/vario/ilec-sc7/vario2.wav</path>
+  <condition>
+    <and>
+      <equals>
+        <property>instrumentation/ilec-sc7/audio</property>
+        <value>2</value>
+      </equals>
+      <greater-than>
+        <property>instrumentation/ilec-sc7/te-reading-mps</property>
+        <value>-10.66</value>
+      </greater-than>
+      <less-than>
+        <property>instrumentation/ilec-sc7/te-reading-mps</property>
+        <value>-0.01</value>
+      </less-than>
+    </and>
+  </condition>
+  <pitch>
+    <property>/instrumentation/ilec-sc7/sound-pitch</property>
+    <offset>0</offset><!-- Do not remove, default is 1 -->
+  </pitch>
+  <volume>
+    <property>instrumentation/ilec-sc7/volume</property>
+    <max>1</max>
+  </volume>
 </variometer-down>
diff --git a/Aircraft/Instruments-3d/glider/vario/ilec-sc7/ilec-sc7.nas b/Aircraft/Instruments-3d/glider/vario/ilec-sc7/ilec-sc7.nas
index a8bc30d05..1c7d66f7a 100644
--- a/Aircraft/Instruments-3d/glider/vario/ilec-sc7/ilec-sc7.nas
+++ b/Aircraft/Instruments-3d/glider/vario/ilec-sc7/ilec-sc7.nas
@@ -9,6 +9,7 @@ setprop("/instrumentation/ilec-sc7/lcd-digits-abs", 0);
 setprop("/instrumentation/ilec-sc7/lcd-digits-sgn", 0);
 setprop("/instrumentation/ilec-sc7/te-reading-mps", 0);
 setprop("/instrumentation/variometer/te-reading-mps", 0);
+setprop("/instrumentation/ilec-sc7/sound-pitch", 1);
 
 # Helper function for updating lcd display
 var update_lcd_props = func(value) {
@@ -34,6 +35,11 @@ var sc7_needle = Dampener.new(
 	dampening: 3,
 	on_update: update_prop("/instrumentation/ilec-sc7/te-reading-mps"));
 
+var sc7_sound = SoundPitchController.new(
+    input: sc7_needle,
+    max_input: 5,
+	on_update: update_prop("/instrumentation/ilec-sc7/sound-pitch"));
+
 var extra_needle = Dampener.new(
 	input: probe,
 	dampening: 2.7,
@@ -66,7 +72,7 @@ setlistener("instrumentation/ilec-sc7/sensitivity",
 # Wrap everything together into an instrument
 var fast_instruments = UpdateLoop.new(
 	update_period: 0,
-	components: [probe, sc7_needle, extra_needle],
+	components: [probe, sc7_needle, sc7_sound, extra_needle],
 	enable: 1);
 
 var slow_instruments = UpdateLoop.new(